package cn.topevery.garden.wapi.utils;

import lombok.extern.slf4j.Slf4j;
import net.sf.json.JSONObject;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

@Slf4j
public class WeChatCommon {

    /**
     * 获取接口访问凭证
     *
     * @param appid 凭证
     * @param appsecret 密钥
     * @return
     */
    public JSONObject getOpenId(String appid, String appsecret, String code) {
        String url = "https://api.weixin.qq.com/sns/jscode2session?appid=APPID&secret=APPSECRET&grant_type=authorization_code&js_code=JSCODE";
        String requestUrl = url.replace("APPID", appid).replace("APPSECRET", appsecret).replace("JSCODE", code);
        // 发起GET请求获取凭证
        JSONObject jsonObject = sendGet(requestUrl);

        return jsonObject;
    }

    /**
     * 向指定URL发送GET方法的请求
     *
     * @param url
     *            发送请求的URL
     * @return URL 所代表远程资源的响应结果
     */
    public JSONObject sendGet(String url) {
        JSONObject jsonObject = null;
        BufferedReader in = null;
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立实际的连接
            connection.connect();
            // 获取所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            BufferedReader bufferedReader = new BufferedReader(in);
            String str = null;
            StringBuffer buffer = new StringBuffer();
            while ((str = bufferedReader.readLine()) != null) {
                buffer.append(str);
            }
            jsonObject = JSONObject.fromObject(buffer.toString());
        } catch (Exception e) {
            System.out.println("发送GET请求出现异常！" + e);
            log.info("发送GET请求出现异常" + e);
            e.printStackTrace();
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return jsonObject;
    }
}
